Needles are used in a number of different aspects of BDSM play. Some use needles purely to cause pain, and in this practice will insert them into varying different arts of the body. Needles are also used for piercing and cutting. Furthermore, needles can be used in medical play scenarios, either in an acupuncture scene, in which case sterilized acupuncture needles are used, or in other medical procedures involving injections, in which case hypodermic needles are used.
I've only recently gotten into needles, but I must say the experience was exhilarating. Nothing quite like pushing the needle through while a submissive is restrained and gagged.
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